kinect/codes/Azure-Kinect-Sensor-SDK/examples/viewer/opengl/viewerutil.h

66 lines
2.0 KiB
C++

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
#ifndef VIEWERUTIL_H
#define VIEWERUTIL_H
#include <sstream>
#include "k4aimgui_all.h"
namespace viewer
{
// Throw an error if OpenGL has encountered an error.
//
inline void CheckOpenGLErrors()
{
const GLenum glStatus = glGetError();
if (glStatus != GL_NO_ERROR)
{
std::stringstream errorBuilder;
errorBuilder << "OpenGL error: " << static_cast<int>(glStatus);
throw std::runtime_error(errorBuilder.str().c_str());
}
}
// Gets the height of the title bar, in pixels
//
inline float GetTitleBarHeight()
{
return ImGui::GetFont()->FontSize + ImGui::GetStyle().FramePadding.y * 2;
}
// Gets the maximum dimensions that an image of size imageDimensions can be scaled to in order
// to fit in a window with imageMaxSize available space while maintaining its aspect ratio.
// imageMaxSize is expected to include space for window padding, but does not account for the
// title bar or any any potential other widgets in your window, so you'll need to subtract those
// from imageMaxSize, if applicable.
//
inline ImVec2 GetMaxImageSize(const ImVec2 imageDimensions, const ImVec2 imageMaxSize)
{
const float sourceAspectRatio = imageDimensions.x / imageDimensions.y;
const float verticalPadding = ImGui::GetStyle().WindowPadding.y * 2;
const float horizontalPadding = ImGui::GetStyle().WindowPadding.x * 2;
const float horizontalMaxSize = imageMaxSize.x - horizontalPadding;
const float verticalMaxSize = imageMaxSize.y - verticalPadding;
ImVec2 displayDimensions;
if (horizontalMaxSize / sourceAspectRatio <= verticalMaxSize)
{
displayDimensions.x = horizontalMaxSize;
displayDimensions.y = horizontalMaxSize / sourceAspectRatio;
}
else
{
displayDimensions.x = verticalMaxSize * sourceAspectRatio;
displayDimensions.y = verticalMaxSize;
}
return displayDimensions;
}
} // namespace viewer
#endif